People who got 6.5 hours of sleep were advised on ways to sleep an hour longer, and when they did, they ate fewer calories without even trying
Read more:Half the group were randomly picked to get advice on how to sleep longer, aiming for 8.5 hours a night. This included tips on keeping to consistent bedtimes and avoiding using phones, computers and watching TV in the last hour before sleep.
For the next two weeks, participants wore activity trackers that recorded when they were asleep and drank chemically labelled water. Then, they provided four urine samples to the researchers, from which their calorie intake was determined. They also weighed themselves every morning and had a body composition scan at the end of the trial.
People in the control group had no change in their sleep patterns and put on a little weight over the two weeks. But those who received the advice slept 1.2 hours a night longer, on average. Their associated drop in calories meant they lost nearly half a kilogram. People reported that cutting out screen use in the evening had the biggest impact on getting more sleep, says Tasali.
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